Wawrinka survives Tsitsipas in five-hour thriller to set Federer clash.
Highlights: Wawrinka v Tsitsipas
Stan Wawrinka squeezed past Stefanos Tsitsipas in a five-hour five-set epic.
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Martic, Sakkari, Svitolina and Mertens find success with coaches under 30.
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Roger Federer punched his ticket to the quarter-finals with a win over Leonardo Mayer.